Package: Fix build issues

Include missing reference assembly.

Include missing reference for base class.

Don't use types from differently-versioned
reference assemblies in XDesProc (which
has no binding redirects)
Remove unneeded interop types
Package: Remove accidental DLL copy
Package: Remove all references to VS2012+ DLLs

Except for Shell.Immutable.
This involves copying some decompiled
code from newer DLLs.

Designer still doesn't work, because XDesProc
is missing BindingRedirects.  I hope to solve
that using AssemblyResolve.
Remove settings alias

Now that we don't reference the conflicting
Microsoft.VisualStudio.Shell.11.0.dll, we can
reference these types directly.
Try handling AssemblyResolve to fix designer

I can't get the handler to fire when loading the
control from Microsoft.VisualStudio.Shell.ViewManager